Replacement Of Anodes; Replacement Of Cooling Water Passage Anode (Cylindrical Shape) - TOHATSU MFS 25D Service Manual

27) Replacement of Anodes

Anodes protect the outboard motor from galvanic
corrosion (corrosion of metal due to very weak electric
current).
Anodes are used in the gear case, mount rubber (lower),
swivel bracket, clamp bracket, PT unit assy, and power
unit.
Replace an anode if the size is reduced to 2/3 that of a
new one.
• Do not coat the anodes with oil or paint.
• Since the area around the anode installation
bolts will be corroded more than the other areas,
be sure to retighten the bolts at every inspection.
28) Replacement of Cooling Water
Passage Anode (Cylindrical Shape)
1. Remove the screw 1 from the anode plug, then remove
the anode 2 .
2. Clean the screw locking agent remaining on the screw
thread of the screw tip and clean each contact surface of
the anode plug.
3. Install a new anode 3 in the anode plug and tighten the
screw to the specified torque.
• Install the anode with the smaller diameter end
facing the screw.
• Apply a screw locking agent (ThreeBond 1342)
to the screw.
Anode Screw:
2.5 N · m (1.84 lb · ft) [0.25 kgf · m]
4. Install a new O-ring 4 and install the anode plug on the
outboard motor.
Apply a thin coat of water-resistant grease on the
O-ring.
Anode Plug:
18 N · m (13 lb · ft) [1.8 kgf · m]
4st 25/30 2022
4 O-ring
Do not reuse.
3
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